Objective: To investigate the quality variation of Lonicera japonica flower from different harvesting periods by ultraviolet visibl(UV-Vis)fingerprint combined with chemometrics. Method: Twenty- five L. japonica flower samples from five harvesting periods, including young bud stage, green bud stage, white bud stage, silver and golden flower stages, were collected, with five samples for each stage. UV-Vis fingerprints of L. japonica flower from different harvesting periods were established in the context of the optimum extraction method based on...